What Is Epilepsy Surgery?
Most people with epilepsy can control their seizures with medication. But they aren't effective for about 30% of patients. In some cases, brain surgery may be an option.
Epilepsy surgery is an operation on the brain to control seizures and improve the person's quality of life. There are two main types of epilepsy surgery:
- Surgery to remove the area of the brain producing seizures.
- Surgery to interrupt the nerve pathways through which seizure impulses spread within the brain.
Surgery is considered only if the area of the brain where the seizures start, called the seizure focus, can be clearly identified, and if the area to be removed is not responsible for any critical functions, such as language, sensation and movement. Extensive evaluation and testing are necessary to determine if surgery is appropriate.
Who Is a Candidate for Epilepsy Surgery?
Surgery may be an option for people with epilepsy whose seizures are disabling and/or are not controlled by medication, or when the side effects of medication are severe and greatly affect the person's quality of life. Patients with other serious medical problems, such as cancer or heart disease, usually are not considered for epilepsy surgery.
What Surgical Options Are Available?
Different surgical procedures are available to treat epilepsy. The type of surgery used depends on the type of seizures and the area of the brain where the seizures start. The surgical options include:
- Lobe resection: The largest part of the brain, the cerebrum, is divided into four paired sections, called lobes -- the frontal, parietal, occipital and temporal lobes. Temporal lobe epilepsy, in which the seizure focus is located within the temporal lobe, is the most common type of epilepsy in teens and adults. In a temporal lobe resection, brain tissue in the temporal lobe is resected, or cut away, to remove the seizure focus. The anterior (front) and mesial (deep middle) portions of the temporal lobe are the areas most often involved. Extratemporal resection involves removing brain tissue from areas outside of the temporal lobe.
- Lesionectomy: This is surgery to remove isolated brain lesions -- areas of injury or defect such as a tumor or malformed blood vessel -- that are responsible for seizure activity. Seizures usually stop once the lesion is removed.
- Corpus callosotomy: The corpus callosum is a band of nerve fibers connecting the two halves (hemispheres) of the brain. A corpus callosotomy is an operation in which all or part of this structure is cut, disabling communication between the hemispheres and preventing the spread of seizures from one side of the brain to the other. This procedure, sometimes called split-brain surgery, is for patients with extreme forms of uncontrollable epilepsy who have intense seizures that can lead to violent falls and potentially serious injury.
- Functional hemispherectomy: This is a variation of a hemispherectomy, a radical procedure in which one entire hemisphere, or one half of the brain, is removed. With a functional hemispherectomy, one hemisphere is disconnected from the rest of the brain, but only a limited area of brain tissue is removed. This surgery generally is limited to children younger than 13 years old who have one hemisphere that is not functioning normally.
- Multiple subpial transection (MST): This procedure is used to help control seizures that begin in areas of the brain that cannot be safely removed. The surgeon makes a series of shallow cuts (transections) in the brain tissue. These cuts interrupt the movement of seizure impulses but do not disturb normal brain activity, leaving the person's abilities intact.
How Effective Is Epilepsy Surgery?
The effectiveness varies, depending on the type of surgery. Some people are completely free of seizures after surgery. For others, the frequency of seizures is significantly reduced. In some cases, surgery may not be successful and a second surgery (re-operation) may be recommended. Most patients will need to continue taking anti-seizure medication for a year or more after surgery. Once seizure control is established, medications may be reduced or eliminated.
What Are the Risks of Epilepsy Surgery?
The risks of epilepsy surgery include:
- Risks associated with surgery: These include infection and bleeding, as well as the risk of an allergic reaction to the anesthesia.
- Risk of neurological deficits: Surgery can worsen existing problems or create new problems with the way the brain functions. Neurological deficits include loss of functions such as vision, speech, memory or movement.
- Risk of surgery failure: Even with careful pre-surgical evaluation, surgery may not eliminate or reduce seizures. Before undergoing surgery your doctor will discuss the potential risks and benefits of the procedure.
- Before undergoing surgery your doctor will discuss the potential risks and benefits of the procedure.
Re-operations
In some cases, isolated seizures may occur immediately following surgery. This does not necessarily mean the operation was not successful. Occasionally, a second operation, or re-operation, is needed to remove brain tissue that is later found to be a source of seizure activity.
WebMD Medical Reference

SLIDESHOW
What Is Epilepsy? Symptoms, Causes, and Treatments See SlideshowHealth Solutions From Our Sponsors
Top Surgical Options for Epilepsy Related Articles
Epilepsy and Seizures: How to Treat?
A seizure is a sudden, uncontrolled electrical disturbance in the brain. Epilepsy is a neurological disorder where brain activities are abnormal, causing more than one or recurrent episodes of seizures. Most cases of seizures can be managed conservatively with medication and supportive treatments.Epilepsy Treatment
Epileptic seizures mostly controlled through drug therapy, particularly anticonvulsant drugs. Types of treatment prescribed depends on several factors including the frequency and severity of the seizures as well as the person's age, overall health and medical history. Other forms of treatment options also exist including ketogenic diet and electrical stimulation.How Successful Is Surgery for Epilepsy?
Epilepsy surgery is a neurosurgical procedure to prevent or reduce the occurrence of epileptic seizures. Epilepsy surgery involves removal or surgical alteration of the part of the brain from which epileptic seizures originate. Success depends on the condition, procedure and severity of the epileptic condition; epilepsy covers many different seizure disorders.Lesionectomy
Brain lesions include tumors, scars from a head injury or infection, abnormal blood vessels, and hemotomas. A lesionectomy is an operation to remove these lesions that sometimes can lead to epilepsy.Multiple Subpial Transection
Brain seizures can begin in critical areas of the brain. A relatively new epilepsy treatment called multiple subpial transection (MST) may be an option. MST stops the seizure impulses by cutting nerve fibers in the outer layers of the brain (gray matter), sparing the vital functions concentrated in the deeper layers of brain tissue (white matter).Pediatric Epilepsy Surgery
There are many different brain disorders associated with epilepsy in children including congenital or acquired. There are three types of pediatric epilepsy surgery:- resective epilepsy surgery,
- corpus callosotomy, and
- vagus nerve stimulation.
What are the Risks and Complications of an Amygdalohippocampectomy?
An amygdalohippocampectomy is a surgical operation to remove a portion of the brain as a treatment for temporal lobe epilepsy. The procedure involves the selective removal of certain portions of the brain’s temporal lobe. The temporal lobes are located beneath the temples on either side of the head.Seizure (Epilepsy)
Epilepsy is a brain disorder in which the person has seizures. There are two kinds of seizures, focal and generalized. There are many causes of epilepsy. Treatment of epilepsy (seizures) depends upon the cause and type of seizures experienced.Seizures Symptoms and Types
Seizures are divided into two categories: generalized and partial. Generalized seizures are produced by electrical impulses from throughout the brain, while partial seizures are produced by electrical impulses in a small part of the brain. Seizure symptoms include unconsciousness, convulsions, and muscle rigidity.Questions To Ask Before Surgery
Surgery is the branch of medicine that employs operations in the treatment of disease or injury. Prior to surgery you might consider asking your surgeon questions about the operation (procedure).Temporal Lobe Resection
The largest part of the brain, the cerebrum, is divided into four paired sections—the frontal, parietal, occipital, and temporal lobes. Each lobe controls a specific group of activities. The temporal lobe, located on either side of the brain just above the ear, plays an important role in hearing, language, and memory. In people with temporal lobe epilepsy, the area where the seizures start -- called the seizure focus -- is located within the temporal lobe.Tumor Grade
Tumor grade is a system used to classify cancer cells in how likely the tumor is to grow and how abnormal they look under a microscope. Tumor grade is not the same as tumor stage. A biopsy is taken to determine if the tumor is benign (non cancerous) or malignant (cancerous).What Are the Main Causes and Symptoms of Epilepsy?
What is epilepsy and what causes it? Learn the signs and symptoms of epilepsy, what causes it, how doctors diagnose it, and what you can do to treat it.What Are the Risks of Epilepsy Surgery?
Epilepsy surgery comes with the risk of tissue and nerve damage, meningitis infection, cerebrospinal fluid leakage, among others specific to each procedure. Epilepsy surgery is a neurosurgical procedure to prevent or reduce the occurrence of epileptic seizures. Epilepsy surgery involves removal or surgical alteration of the part of the brain which is the focal point for onset of seizures.What Causes Myoclonic Seizures in Babies?
Epileptic syndromes that cause myoclonic seizures usually begin in early childhood, and last throughout life, though milder forms may improve with adulthood. Doose syndrome (myoclonic-atonic epilepsy), Dravet syndrome (severe myoclonic epilepsy of infancy [SMEI]) and Lennox-Gastaut syndrome are all childhood epilepsy syndromes that may cause seizures in babies and toddlers.